Title :
Spectral dependence of light-induced microwave reflection coefficient from optoelectronic waveguide gratings
Author_Institution :
Inst. fur Hochfrequenztech. und Optoelektronik, Bundeswehr Hamburg Univ., Germany
fDate :
1/1/1995 12:00:00 AM
Abstract :
After a short description of the method of operation of optoelectronic microwave filters, a detailed analysis of the spectral dependence of light-induced microwave reflection coefficient from an optoelectronically generated distributed Bragg reflection waveguide grating is reported. The theory is based on an improved stepped-impedance model utilizing a diffusion-controlled abrupt-profile approach of photoconductivity along with a conformal mapping technique for the quasi-static evaluation of the spectral performance of photoinduced wave attenuation. The validity of theory is clarified and the calculated results are compared with experimental results. As a useful result for future applications, an optimum excitation wavelength of about 825 nm for a fiber-optically controlled lab-tested 50 Ω full-substrate silicon coplanar waveguide has been obtained
Keywords :
coplanar waveguides; diffraction gratings; electromagnetic wave reflection; microwave filters; optical planar waveguides; optical waveguide components; 50 ohm; 825 nm; conformal mapping technique; diffusion-controlled abrupt-profile approach; distributed Bragg reflection waveguide grating; fiber-optically controlled coplanar waveguide; light-induced microwave reflection coefficient; optoelectronic microwave filters; optoelectronic waveguide gratings; periodic-structure waveguide; photoconductivity; photoinduced wave attenuation; quasi-static evaluation; stepped-impedance model; Bragg gratings; Conformal mapping; Microwave filters; Microwave generation; Microwave theory and techniques; Optical attenuators; Optical fiber theory; Optical reflection; Photoconductivity; Spectral analysis;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
